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Index > Main > Clarification on agner's optimization manual
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alessandro95



Joined: 24 Mar 2013
Posts: 62
alessandro95 28 May 2013, 10:52
I was reading Agner's optimization manual, microarchitecture volume while (last page) I found this sentence that caused me some doubts:

Agner's manual wrote:

The x86 instruction set now has more than a thousand logically different instructions,
including specialized instructions for text processing, graphics, cryptography, CRC check,
and complex numbers. The instruction set is likely to be increased with every new processor
generation, at least for marketing reasons. We may see more application-specific
instructions, such as Galois field algebra vector instructions for encryption purposes.


I never heard something like this before, and especially the complex numbers part sounds interesting to me but google seems unable to help so I think I'm misunderstanding the sentence I quoted, what exactly "logically different" means?
And what are those instructions made to deal with complex numbers?
Post 28 May 2013, 10:52
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
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revolution 28 May 2013, 12:03
Have you tried asking Agner what Agner meant? AFAIK Agner does not visit this board, or has not stated it publicly at least.
Post 28 May 2013, 12:03
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alessandro95



Joined: 24 Mar 2013
Posts: 62
alessandro95 28 May 2013, 12:35
I thought someone on this board might know, but I didn't think about asking him directly Embarassed
I just sent him an email
Post 28 May 2013, 12:35
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alessandro95



Joined: 24 Mar 2013
Posts: 62
alessandro95 28 May 2013, 14:18
wow, that was a quick answer:

Agner wrote:

the addsubpd and and vfmaddsub.. instructions are mainly used in complex multiplication and division


guess this thread can be closed
Post 28 May 2013, 14:18
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